Windmarked Pixels

[Shrike]

Hah, bet that title caught your attention.   
..
*Cough*
I've been chewing on this one idea for quite a bit of time now.  It's gone through several stages in my head, but this is the closest it's gotten to a complete thingy.  It's my own set of restrictions; they wouldn't be due to limitations of hardware, but I think they're interesting anyways.  Feel free to brainstorm, dethrone, spin-off or whatever else you want; just an idea right now.
Meant for making large scenery.
Further Explanation

This is a set of restrictions that you could choose to apply when you are drawing Pixel art.  Tests are below.  It would be somewhat similar to drawing in the restrictions of an old system; i.e. EGA colors, NES Pallette and restrictions, etc.

LINE DRAWING MODE
The suckiest name in the galaxy

-All deliberately drawn lines MUST be either horizontal ( ------ ) or vertical ( | ).
-Only three colors may be used: Black, white, and an exact 50% color of your choice.*  Changed.  Color restrictions were too harsh.  You may now choose any two colors, but there is still black and white as the first two out of four.
-Perpendicular lines must be 1px apart.
-Background color can be exempt from rules 1 & 3.
-Large spaces may be solid in color, as long as it contains no detail.
-Dithering is encouraged.
-Checkerboard dither is allowed.
-If two colors are different, they need not be separated by the 1px rule.

*Sample 50% colors (Actually I think these are the only possible ones):

  Choose any two colors you wish.
I have yet to test it out.  Really, I'm posting this for crits.  Thoughts?  How stupid is it?
Thanks,
Shrike

[Mabelma]

I don't really get what this is. Could you be a bit clearer?

[Shrike]

Now that I think about, I'm not sure I do either.  Further explanation added, and color restrictions changed.

[Pawige]

I think a pioneering example of what you're starting would really help me grasp what you're trying here.